These pages provide access to water-resources data collected at
approximately 1.9 million sites in all 50 States, the District of Columbia,
Puerto Rico, the Virgin Islands, Guam, American Samoa and the Commonwealth of the Northern Mariana Islands.
Online access to this data is organized around the categories
listed to the left.

The USGS investigates the occurrence, quantity, quality, distribution,
and movement of surface and underground waters and disseminates the
data to the public, State and local governments, public and private
utilities, and other Federal agencies involved with managing our water
resources.